A Maryland state trooper was arrested after a Grand Jury indicted him on charges he assaulted a man being arrested following a pursuit on I-95 in Harford County last fall.

Trooper Matin M. Dunlap, 25, is charged with one count of first-degree assault, three counts of second-degree assault and two counts of misconduct in office in connection to the incident on Oct. 22, 2015.

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Police said Dunlap turned himself in to investigators at the Bel Air Barrack just before 1 p.m. Wednesday. After processing, he had an initial appearance before a court commissioner and was released on $1,000 bond.

An investigation into Dunlap's actions began when troopers involved in the arrest of Dennis Donoghue, 55, of Riverdale, filed a complaint.

The investigation found Donoghue was stopped on the right shoulder of northbound I-95 near White Marsh. Police said Dunlap spotted the stopped vehicle and pulled up behind it.

As the trooper walked up to the stopped the occupant, later identified as Donoghue, accelerated away. Dunlap called the barrack and began to follow the vehicle with his emergency equipment activated.

Police said Donoghue turned off his vehicle lights and continued north on I-95, refusing to pull over and stop before additional troopers joined the pursuit. During the pursuit, Donoghue’s car collided with a marked patrol car driven by a supervisor from the JFK Barrack, police said.

Police said a trooper first class and a corporal who had been in the pursuit were the first to reach Donoghue and get him out of his car. They told investigators that Donoghue was passively resisting and they were not able to handcuff him.

The trooper, reported that while attempting to handcuff Donoghue, who was lying on the ground, Dunlap began to repeatedly jab the man in the abdomen and side with a metal expandable baton. The trooper also struck and injured the hand of one of the troopers trying to handcuff the driver, police said.

Investigators said a state police corporal grabbed Dunlap’s expandable baton in an attempt to stop him from striking Donoghue. The corporal said that Dunlap pulled the baton away and continued to jab Donoghue.

A state police sergeant arrived at the scene and forcibly pushed Dunlap away from Donoghue and ended the assault. Donoghue did not request or require medical treatment, according to troopers who arrested him and sent him to the Harford County Detention Center.

Police said that troopers reported to barrack command staff what they saw Dunlap do, and the criminal investigation began the next morning. Dunlap, who has been employed with state police since July 2013, was suspended with pay and assigned to administrative duties when the criminal investigation began. He is now suspended without pay following his arrest.

The Maryland State Police Internal Affairs Unit is also investigating the actions of Dunlap.